摘要 |
PROBLEM TO BE SOLVED: To provide an optical head device which has an excellent reproducing characteristic hardly being influenced by a double refractivity even when an optical recording medium has the double refractivity. SOLUTION: In the optical head device 1, laser beams L1 and L2 which are reflected on the optical recording medium D return through an objective 13, a collimating lens 12, and a rising mirror 11, reaches a light-receiving element 9 via a half mirror 7 after returning again to a prism 6. In this case, the total transmission efficiency of each of the partial reflective faces 60 and 70 of the prism 6 and the half mirror 7 is nearly equal with respect to a P- polarized light and a S-polarized light. Thus, a stable reproducing characteristic is available even when the optical recording medium D has the double refractivity. |